The Tap Tempo is the ultra compact pedal that gives you the ability to control multiple delay and/or tremelo pedals.
The Normally Open switch works with pedals that accept an external tempo and/or expression pedal such as the Eventide RC series, JHS, Electro-Harmonix, Cusack, Chase etc.
If your only running Boss then purchase a Normally Closed Tap Tempo pedal. This will also work with Boss pedals like the DD5, DD7, DD20, RE-20 but tap on the upstroke.
This pedal has the soft touch switch for easy tapping